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The Quantum and the Classical Domains As Provisional Parallel Coexistents

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The Quantum and the Classical Domains As Provisional Parallel Coexistents The quantum and the classical domains as provisional parallel coexistents . Michel Paty To cite this version: Michel Paty. The quantum and the classical domains as provisional parallel coexistents .. Synthese, Springer Verlag (Germany), 2000, 1-2, p. 179-200. halshs-00185365 HAL Id: halshs-00185365 https://halshs.archives-ouvertes.fr/halshs-00185365 Submitted on 12 Nov 2007 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. 1 Synthese (Kluwer, Dordrecht/Boston), 125, n°1-2, oct.-nov. 2000, 179-200 (French, Steven ; Krause, Décio ; Doria, Francisco (eds.), In honour of Newton da Costa, on the occasion of his seventieth birthday). The quantum and the classical domains as provisional parallel coexistents Michel PATY An essay in honour of Newton da Costa with admiration, friendship and saudades ABSTRACT. We consider the problem of the relationship between the quantum and the classical domains from the point of view that it is possible to speak of a direct physical description of quantum systems having physical properties. We put emphasis, in evidencing it, on the specific quantum concept of indistiguishability of identical in a conceptual way (and not in a logical way in the vein of «da Costa's school»). In essence, the subsequent argumentation deals with the relationship between the classical and the quantum, with the problem of the quantum theory of measurement. Even in the absence of a definitive response to this problem, the best attitude for the time being, as we cannot reduce the classical and the quantum one to the other, seems to be to accept their pacific coexistence, and this is possible with the tolerance principle of the «pragmatic truth» developed from a logical point of view by Newton da Costa. RESUMO. As áreas quântica e clássica enquanto provisórios coexistentes parallelos. Abordamos o problema da relação entre as áreas do quântico e do clássico considerando que é possível falar de uma descrição física direta de sistemas quânticos tendo propriedades. Insistimos, para isto, sobre o conceito especificamente quântico da indicernabilidade dos idênticos de um ponto de vista conceptual (não de um ponto de vista lógico à maneira da «escola da Costa») como evidenciando isto. O essencial da argumentação a seguir tem como enfoque a relação clássico-quântico, com o problema da teoria quântica da medição. Mesmo não tendo uma resposta definitiva para este, a melhor atitude por enquanto, já que não se podem reduzir um ao outro o clássico e o quântico, nos parece ser esta de aceitar sua coexistência pacífica, o que é possível com o princípio de tolerância da «verdade pragmática» desenvolvida logicamente por Newton da Costa. RESUME. Les domaines quantique et classique, provisoires coexistants parallèles. Le problème des rapports entre les domaines quantique et classique est abordé en adoptant le point de vue selon lequel il est possible de parler de description physique directe de systèmes quantiques ayant des propriétés. Pour ce faire, un accent particuler est mis sur le concept spécifiquement quantique d'indiscernabilité MICHEL PATY THE QUANTIUM AND THE CLASSICAL DOMAINS AS PARALLEL COEXISTENTS 2 des identiques de manière conceptuelle (et non logique à la manière de l'«école de da Costa»). L'argumentation porte ensuite essentiellement sur la relation classique- quantique, avec la question de la théorie quantique de la mesure. Même en l'absence d'une réponse définitive à ce sujet, la meilleure attitude à prendre semble, en l'état actuel des choses, puisque le classique et le quantique ne peuvent être réduits l'un à l'autre, de s'en tenir à leur coexistence pacifique, ce qu'autorise le principe de tolérance de la «vérité pragmatique» développée sous l'aspect logique par Newton da Costa. CONTENTS 1. Introduction. Logical and conceptual approaches in quantum physics 2. On a proper theory of the representation of physical quantum systems 3. The classical and the quantum domains. Frontier or barrier ? 4. Self-consitency of the quantum level and its relative autonomy 5. Relative autonomy of the classical domain as well 6. A provisional duality of representations and the idea of pragmatic truth 1 INTRODUCTION. LOGICAL AND CONCEPTUAL APPROACHES IN QUANTUM PHYSICS Newton da Costa and his collaborators' approach to the logical and epistemological aspects of scientific theories and theoretical physics1 are of concern for quantum theory along two paths (letting aside a third one, that of decidability theorems which they, up to now, have developed only, as far as I know, for classical dynamical theories2). The first one is their treatment of the indistiguishability of identical particles, by which they suggest considering the problem not from a conceptual or a theoretical but from a logical point of view. As quantum systems or particles that are totally identical cannot be dealt with as if they were independent and separated, because of the «quantum statistical» properties, they suggest considering them as a generic kind of particles that are referred to elements of ensembles that are not independent and distinct one from the other3. The mathematical set theory at the basis of their physico-mathematical treatment is no longer the classical (Zermelo-Frenkel) set theory, but a different one that includes the impossibility to distinguish, in an ensemble of identical elements, one of these elements from the others, although we can count them. In such a way, the physical theory itself - i.e., the usual quantum theory - remains unaffected, and the necessary change required by the quantum specificity - 1 See, for example, the recent books : da Costa [1997a & b], da Costa, Béziau & Bueno [1998]. 2 Da Costa & Doria [1991], da Costa [1997a], p. 182-186. 3 See, in particular : French & Krause [1995], French & Krause [1999], Krause & French [1995]. See also, in a similar direction : Dalla Chiara & Toraldo di Francia [1993]. MICHEL PATY THE QUANTIUM AND THE CLASSICAL DOMAINS AS PARALLEL COEXISTENTS 3 irreductible to classical physics - is brought to the deep root of the theorical and mathematical representation, the underlying logics itself. This is an elegant and formal way to continue dealing with the «quantum-classical» concepts of quantum mechanics, describing quantum systems whatever they are with the help of classical particle concepts, these being transformed by being submitted to non classical rules for their utilization and for attribution of physical meaning to them. The logical refoundation of the whole theoretical structure is pragmatically equivalent to the rules of the quantum algorithm, but with a different basis, justified in reason (and in logics), when the standard justification of the quantum rules remains essentially pragmatic and even «ad hoc», not to say arbitrary. This attempt at a logical refoundation of quantum mechanics adds to the various solutions proposed to the quantum mechanical interpretation problem. The most «dramatic» stake of the quantum debate is whether the quantum theory and concepts describe or not real physical systems that have definite physical properties. The logical approach aims clearly at such a description while keeping quantum mechanics - the theory - as well as a good part of its standard interpretation (bohrian complementarity). It can be viewed therefore as a tentative to reconcile a realist view of the natural world with the statements of the Copenhague interpretation that are usually presented and conceived as being of a subjectivist type. But here the subjectivist character would be left aside, as the corresponding statements would be given, through the new logics, a possible objective basis. Unless, indeed, one wants to refer the new approach to a «logical foundation for a subjectivist conception», but this would be a question of mere definition. In any case, the method would be an objective one, with a new logical basis. In what follows, I will in a first stage consider another proposal, alternative also to the standard interpretation, accepting both quantum theory and its classical logics foundations, but modifying the usual understanding of quantum concepts so as to make of quantum theory a direct representation of physical entities and properties. This approach has in common with the «logicist» one the founding role given to indistinguishability, but this time conceived not as a logical requisit but as a conceptual or even a principle physical statement. After sketching this proposal of a «proper direct quantum representation» for quantum physics, I shall evoke next the problem of the relation, in this perspective, of the quantum to the classical domains. This problem is generally considered as that of a reduction of one to the other, be it of the quantum specificity to a classical description through macroscopic measurement arrangements, or of the classical level of the organization of matter to its elementary quantum constituents. But it can also be that of a self- consistency of the description, from a theoretical point of view, of each of these two levels, the classical and the quantum, up to a quasi-autonomy
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